Source of Russian tea (7)

I believe the answer is:

samovar

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'source' is the definition.
(I have seen 'source of drink' mean 'samovar' so perhaps 'source' could also mean 'samovar')

I cannot understand how the rest of the clue works.

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(Other definitions for samovar that I've seen before include "Russian water boiler often used for tea" , "tea maker" , "Russian tea-urn" , "tea provider" , "Spoken" .)

I've seen this clue in the Evening Standard.

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